Telephone line security apparatus

Details Telephone line security apparatus Telephone line security apparatus

1982-04-16

1985-05-28

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2208, H04L 900, H04K 100

Patent

active

045202338

ABSTRACT:
A telephone security apparatus placed at a subscriber station intercepts and screens incoming calls direct to a terminal through a modem. The security apparatus prevents completion of a connection to the terminal equipment unless the incoming call provides a predefined access code and the call is found to have been made from the remote subscriber station to which the predefined access code has been assigned. The security apparatus automatically dials back the subscriber station corresponding to the access code given on the incoming call. A microprocessor-based embodiment is described.

REFERENCES:
patent: 4154988 (1979-05-01), Fechalos et al.
patent: 4182933 (1980-01-01), Rosenblum
patent: 4277649 (1981-07-01), Sheinbein
patent: 4313176 (1982-01-01), Cecil
patent: 4369339 (1983-01-01), Castro et al.
patent: 4402073 (1983-08-01), Hammond
patent: 4430728 (1984-02-01), Beitel et al.

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